Physical standards of male students at high schools in Fukushima Prefecture were recorded to compare the data obtained during the three year period of Showa 28 to 30 with those of Showa 38 to 40 to see the chronological change during the 10 years. Also study was made on the regional difference in the growth by dividing Fukushima Prefecture into the four regions of north, south, Aizu and coast. Following are the data obtained from the study. Height : When the height of students in Fukushima Prefecture was compared with the Japanese standard height, boys from the north district were found tallest, and boys from the south district were shortest regardless of the above period. The regional difference was most conspicuous among the boys of the first-year grade, but the regional difference has decreased in 10 years. The growth rate by Cohort between the new students of Showa 28 and Showa 38 showed that the boys from the districts of short stature at the time of entering school had the highest rate of growth. This indicates that the gap between new students from districts of short and tall stature is decreasing as they are promoted to higher grades. The growth percentage of standard height observed in the high school students from the points of standard deviation and coefficient of variation have been uniform during the 10 years. Weight : The students of all grades showed remarkable increase in their standard weight. No regional difference was observed throughout the 10 years. However, uniformity of increase in weight became less after 10 years. This means, unlike height, there were many boys whose weight increase were significant. Chest : The statistics during the 3 years from Showa 28 to 30 showed that the students in Aizu district had the broadest average chest. It is interesting to note that the boys in Aizu who had the second shortest stature to those in the south district had the bradest chest. However, in 10 years, this characteristic was lost and no regional difference was recognized. Uniformity showed a tendency of becoming less in 10 years as well as the regional differences. Sitting Height : During the 10 years, increase in the sitting height, especially among the first-grade students, is striking. Uniformity of increase was greater 10 years later, and its rigional difference tended to become less.

The relationship between the body length in adulthood and the developmental level of bones of toes of the same individual, was analyzed among school boys and girls. The author confirmed the possibility of prediction of one's stature in adulthood by means of his X-ray photograph of epiphyseal cartilages of toes.

In a farm village of paddy field single crop area in Tohoku region of Japan, blood pressure of villagers was measured 3 times, in 1957, 1963 and 1967. Three hundred and twenty of 2452 subjects who were 30 years or over in 1957 were died through those 10 years. Mean blood pressure in 1957 was compared by cause of deaths. By deaths from cerebrovascular disease, which is the dominant cause of deaths, the blood pressure level was higher than the control survival group in both systolic and diastolic, though the difference was not recognized in the age group of under 40 and over 69 years. By deaths from heart diseases only systolic was higher, and by deaths from cancer and other causes the difference of blood pressure was scarcely recognized. Blond pressure changes not only through 10 years but also through 6 or 4 years interval showed a significant tendency that the higher the blood pressure measured in the former time the more dropped the blood pressure in the later time. The tendency is contrary to that found in South Wales by Miall and Lovell. The reason why such blocd pressure change has happened, is elucidated by the fact that most persons who were declared high blood pressure at the first time examination voluntarily received practitioners' medical treatment. Relation between the first time blood pressure and cardiovascular disorders found in the later examination was significant in retinograph rather than in electrocardiogram.

The infectious hepatitis which frequently occurred at Sashima district in Ibaragi prefecture since the beginning in 1963, so-called Sashima hepatitis, is considerably different from already reported hepatitis, and shows various characteristics from the standpoints of epidemiology and clinical pathology ; to investigate the said hepatitis may greatly serve to the epidemiological study on hepatitis and the author tried to pursue the causes of multiple outbreak of Sashima hepatitis. The author studied it from various standpoints as to 330 patients who could be diagnosed in the early period of prevalence, the patients from April in 1964 till now and the healthy persons living in the same district. The results were as follows : I Epidemiological Pictures of Sashima Hepatitis (1) In the early period of prevalence, the disease was not observed among younger people, and also, after the first outbreak the age distribution was the same picture despite of persistent epidemic. (2) As to the outbreak of new patients after the early period, it was presumed that there was only the past infection and not the new infection, according to the results of liver biopsies, liver function tests and serum γ-globulin values. (3) It was pointed out that intra-family infection did not so frequently occur according to the family aggregation and the time distribution of the onset from the first patient to the second one in a family. (4) Expansion of the infected area was not recognized. According to the present results, there may be considered that a district was exposed to the infection widely at the same time and the inhabitants were infected. II Investigation on the Route and the Time of Infection Considering the above-described factors, the route of spreading through water or foods would be, of course, suggested, and it was researched. (1) The investigation on the widely employed foods in the community where patients lived, denied food borne infection. (2) The drinking water in this district was all the water from shallow wells, which might be easily contaminated. (3) The surface level of the well water clearly distinguished the infected district fromthe non-infected one. (4) The distribution of the patients in the early period was well coincident with thesystem of the underground water. (5) According to the investigation on the weather in the past period, there was foundout the chances by which the underground water would be widely contaminated by heavy rainor prolonged rains. As the conclusion derived from the present researchs, there may be naturally presumed that Sashima hepatitis is due to a temporary exposure, and according to the investigation on the contaminative route, the underground water was recognized to be contaminated, furthermore, the weather conditions which could be presumed to cause wide contaminating was also clarified. The fact that Sashima hepatitis is remaining in the district of this water system but does not spread to the other area will suggest termination of the infection, and though the suggestion that the disease will be hardly spread through other routes would be a leap in argument, any other reasonable suggestion cannot be found out in the research.